I have a sudden problem when my server reboot and mount to a NFS
failed, so I neeed to mount
by hand. (But it was okay before...)


mount: trying xxxx prog 100003 vers 3 prot udp port 2049
mount: trying xxxx prog 100005 vers 3 prot udp port 891
mount: xxxx:/data0/tmp failed, reason given by server: Permission

Many pages in the web said it is related to the hostname and ip
mapping, which made permission issues,
but in my NFS server, I see the permission is ok:


authenticated mount request from xxxx for yyyy...

Any idea for this funny problem?